生物质炭-四氧化三铁磁性纳米颗粒的制备及其在水中银检测上的应用  

Preparation of Biochar-Fe_(3)O_(4) Magnetic Nanoparticles and Its Application of Detection of Silver in Water

作　　者：秦园 吴建兵[1] 沈怡佳 吴梅[1] 朱楠 陈蓉 陈祝军[1] QIN Yuan;WU Jianbing;SHEN Yijia;WU Mei;ZHU Nan;CHEN Rong;CHEN Zhujun(Zhangjiagang Center for Disease Control and Prevention,Suzhou 215600,China)

机构地区：[1]张家港市疾病预防控制中心,苏州215600

出　　处：《理化检验(化学分册)》2025年第4期459-462,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：苏州市应用基础研究(医疗卫生)科技创新项目(SYW2024147);张家港市科技计划项目(ZKYL2203)。

摘　　要：以柚子皮粉末、六水合三氯化铁、尿素为原料通过一步水热法制备生物质炭-四氧化三铁磁性纳米颗粒(NC/Fe_(3)O_(4)NPs)。取10.0 mL水样,加入10.0 mg NC/Fe_(3)O_(4)NPs,振荡15 min,用磁铁吸附NC/Fe_(3)O_(4)NPs,与溶液分离,弃去溶液,再加入5.0 mL水洗涤NC/Fe_(3)O_(4)NPs,弃去溶液,重复洗涤3次,加入5.0 mL 30%(体积分数)硝酸溶液,振荡15 min,磁性分离NC/Fe_(3)O_(4)NPs,收集溶液,采用石墨炉原子吸收光谱法测定水中银的含量。结果表明,银的质量浓度在0.20~10.0μg·L^(-1)内与对应的吸光度呈线性关系,检出限(3s)为0.13μg·L^(-1)。对6.0μg·L^(-1)银标准溶液测定6次,测定值的相对标准偏差为2.6%。按照标准加入法对实际样品进行回收试验,回收率为91.5%97.5%。Biochar-Fe_(3)O_(4)magnetic nanoparticles(NC/Fe_(3)O_(4)NPs)were prepared through a one-step hydrothermal method using pomelo peel powder,ferric chloride hexahydrate,and urea as materials.10.0 mL of water sample was taken,and 10.0 mg of NC/Fe_(3)O_(4)NPs was added and the mixture was shaken for 15 min.A magnet was used to adsorb NC/Fe_(3)O_(4)NPs and separate it from the solution.The solution was discarded,and NC/Fe_(3)O_(4)NPs was washed with 5.0 mL of water.The solution was discarded,and the washing process was repeated 3 times.5.0 mL of 30%(volume fraction)nitric acid solution was added and the mixture was shaken for 15 min.The solution was collected by magnetic separation of NC/Fe_(3)O_(4)NPs,and the silver in water was determined by graphite furnace atomic absorption spectrometry.As shown by the results,linear relationship between the corresponding absorbance and mass concentration of silver was found in the range of 0.20-10.0μg·L^(-1),with detection limit(3s)of 0.13μg·L^(-1).6.0μg·L^(-1)silver standard solution was determined 6 times,and RSDs of the determined values was 2.6%.Test for recovery was made by standard addition method on actual samples,giving results in the range of 91.5%-97.5%.

关 键 词：生物质炭-四氧化三铁磁性纳米颗粒(NC/Fe_(3)O_(4)NPs) 磁性固相萃取 石墨炉原子吸收光谱法 银 

分 类 号：O657.31[理学—分析化学]